I'm not American, but it doesn't sound to me like this is less radical of a solution. For a country that espouses the principle of free speech so passionately -

I'm not American, but it doesn't sound to me like this is less radical of a solution. For a country that espouses the principle of free speech so passionately - in my experience, from both sides of the political divide - for the USA to require a form of 'proof of credibility' before allowing a citizen to participate in social and political debate would be for it to lose perhaps the most important part of its identity. Would that situation preserve 'America' more than a collection of not-so-united states which would probably retain bilateral trade and travel agreements, as well as the now-immutable, deep-rooted cultural ties?